Laser refrigeration of optically levitated sodium yttrium fluoride nanocrystals

2021 ◽  
Author(s):  
Danika Luntz-Martin ◽  
R. Felsted ◽  
S. Dadras ◽  
Peter Pauzauskie ◽  
Nickolas Vamivakas
Keyword(s):  
Yttrium Fluoride

scholarly journals Barium yttrium fluoride based upconversion nanoparticles as dual mode image contrast agents

2021 ◽  
pp. 111937
Author(s):  
Padmaja Parameswaran Nampi ◽  
Alexander Vakurov ◽  
Hema Viswambharan ◽  
Jürgen E. Schneider ◽  
Rik Drummond-Brydson ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Image Contrast ◽  
Upconversion Nanoparticles ◽  
Dual Mode ◽  
Yttrium Fluoride ◽  
Barium Yttrium ◽  
Barium Yttrium Fluoride

scholarly journals Multi-Step Crystallization and Chemical Evolution of Sodium Yttrium Fluoride

2021 ◽  
Author(s):  
Peter Pauzauskie ◽  
Alexander Bard ◽  
R. Greg Felsted ◽  
Abbie Ganas ◽  
Anupum Pant ◽  
...  
Keyword(s):  
Solid Phase ◽  
Nucleation And Growth ◽  
Intermediate Step ◽  
Gradual Change ◽  
Fluoride Ions ◽  
Aqueous Synthesis ◽  
Yttrium Fluoride ◽  
New Perspective ◽  
Step Mechanism ◽  
Step Crystallization

Abstract Two-step crystallization mechanisms based on spinodal decomposition followed by nucleation are commonly observed both in the laboratory and in nature. While this pathway may require chemical reactions, subsequent nucleation and growth are often considered as separate, discrete events from the reaction itself. Recent work has also shown a distinct intermediate step involving the formation of an amorphous aggregate. Here we report a novel four-step mechanism in the aqueous synthesis of sodium yttrium fluoride involving 1) the segregation of aqueous ions into a dense liquid phase, 2) the formation of an amorphous aggregate, 3) nucleation of a cubic YF3 phase, and 4) subsequent solid-state diffusion of sodium and fluoride ions to form a final NaYF4 phase. The final step involves a continuous, gradual change of the solid phase’s chemical stoichiometry from YF3 toward NaYF4. Unlike previously studied nucleation and growth mechanisms, the stoichiometry of the final solid phase evolves throughout the crystallization process rather than being determined at nucleation. This novel four-step mechanism provides a new perspective into the nucleation and growth of many other crystalline materials given the ubiquity of nonstoichiometric compounds in nature.

Enhanced up-conversion emission in Er3+ doped barium–natrium–yttrium–fluoride phosphor by alkali ions introduction under 1550 nm excitation

CrystEngComm ◽  
2021 ◽  
Author(s):  
Feng Hu ◽  
Qian Wan ◽  
Liping Lu ◽  
Haiying Sun ◽  
Xiyan Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Combustion Synthesis ◽  
Low Temperature Combustion ◽  
Yttrium Fluoride ◽  
Alkali Ions ◽  
Temperature Combustion

Multi-component fluoride phosphors BaxNay-nMnYzF2x+y+3z+3m: Er3+m (M=Li, K) sensitive to 1550 nm were synthesized by the low temperature combustion synthesis (LCS) method. The optimum batch formula was determined by the orthogonal...

scholarly journals Structural and Fluorine Plasma Etching Behavior of Sputter-Deposition Yttrium Fluoride Film

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 936 ◽  
Author(s):  
Wei-Kai Wang ◽  
Yu-Xiu Lin ◽  
Yi-Jie Xu
Keyword(s):  
Plasma Etching ◽  
Photoelectron Spectroscopy ◽  
Heating Temperature ◽  
Working Pressure ◽  
Etching Depth ◽  
Yttrium Fluoride ◽  
X Ray ◽  
Substrate Heating ◽  
Etching Behavior ◽  
Etched Surface

Yttrium fluoride (YF3) films were grown on sapphire substrate by a radio frequency magnetron using a commercial ceramic target in a vacuum chamber. The structure, composition, and plasma etching behavior of the films were systematically investigated. The YF3 film was deposited at a working pressure of 5 mTorr and an RF power of 150 W. The substrate-heating temperature was increased from 400 to 700 °C in increments of 100 °C. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction results confirmed an orthorhombic YF3 structure was obtained at a substrate temperature of 700 °C for 2 h. X-ray photoelectron spectroscopy revealed a strongly fluorinated bond (Y–F bond) on the etched surface of the YF3 films. HRTEM analysis also revealed that the YF3 films became yttrium-oxyfluorinated after exposure to fluorocarbon plasma. The etching depth was three times lower on YF3 film than on Al2O3 plate. These results showed that the YF3 films have excellent erosion resistance properties compared to Al2O3 plates.

Accumulated photon echo in neodymium-doped disordered yttrium fluoride crystals

1995 ◽  
Vol 51 (9) ◽  
pp. 6085-6088 ◽  
Author(s):  
Keith W. Ver Steeg ◽  
Alexander Ya. Karasik ◽  
Roger J. Reeves ◽  
Tasoltan T. Basiev ◽  
Richard C. Powell
Keyword(s):  
Photon Echo ◽  
Yttrium Fluoride ◽  
Fluoride Crystals

Ac response of polycrystalline sodium yttrium fluoride

1994 ◽  
Vol 69 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Md. Shareefuddin ◽  
M. Narasimha Chary
Keyword(s):  
Yttrium Fluoride ◽  
Ac Response

High temperature X-ray diffraction studies on sodium yttrium fluoride

2004 ◽  
Vol 377 (1-2) ◽  
pp. 162-166 ◽  
Author(s):  
M.D. Mathews ◽  
B.R. Ambekar ◽  
A.K. Tyagi ◽  
J. Köhler
Keyword(s):  
High Temperature ◽  
X Ray Diffraction ◽  
Yttrium Fluoride ◽  
X Ray

An organically templated yttrium fluoride with a ‘Super-Diamond’ structure

2007 ◽  
Vol 180 (1) ◽  
pp. 260-264 ◽  
Author(s):  
Nicholas F. Stephens ◽  
Philip Lightfoot
Keyword(s):  
Diamond Structure ◽  
Yttrium Fluoride

Complex admittance study of potassium yttrium fluoride

1994 ◽  
Vol 22 (2-3) ◽  
pp. 159-164 ◽  
Author(s):  
Md. Shareefuddin ◽  
K. Narasimha Reddy ◽  
M. Narasimha Chary
Keyword(s):  
Yttrium Fluoride ◽  
Complex Admittance ◽  
Potassium Yttrium Fluoride
Sign in / Sign up

Export Citation Format

Share Document